group of tissues that work together to perform closely related functions an individual living thing group of individuals of the same species that live in the same area

1. Organs

group of tissues that work together to perform closely related functions

2. Organisms

an individual living thing

3. Populations

group of individuals of the same species that live in the same area.

4. Communities

assemblage of different populations that live together in a defined area.

5. Ecosystems

all the organisms that live in a place, together with their nonliving environment

6. Biosphere

part of Earth in which life exists including land, water, and air or atmosphere

7. Levels of organization

1.Molecules. 1.Cells, 3.Tissues, 4.organs, 5.Organisms, 6.Populations, 7.Communities, 8.Ecosystems, 9.Biosphere

8. independent variable

factor in a controlled experiment that is deliberately changed.

9. independent variable

aka manipulated variable

10. dependent variable

variable that is observed and that changes in response to the independent variable.

11. dependent variable

aka responding variable